package com.lys.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.lys.eduservice.entity.EduSubject;
import com.lys.eduservice.entity.excel.SubjectData;
import com.lys.eduservice.service.EduSubjectService;
import com.lys.servicebase.exceptionhandler.GuliException;



public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {
    //因为SubjectExcelListener不能交给spring进行管理，需要自己new，不能注入其他对象
    //不能实现数据库操作
    public EduSubjectService eduSubjectService;
    public SubjectExcelListener() { }
    public SubjectExcelListener(EduSubjectService eduSubjectService) {
        this.eduSubjectService = eduSubjectService;
    }

    @Override
    //读取excel内容，一行一行进行读取
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {
        if (subjectData==null){
            throw new GuliException(20001,"数据为空");
        }
        //一行一行读取，每次读取有两个值，第一个值一级分类，第二个值二级分类
        //判断一级分类是否重复
        EduSubject existOneSubject = existOneSubject(eduSubjectService,subjectData.getOneSubjectName());
        if (existOneSubject == null){//没有相同一级分类，进行添加
            existOneSubject = new EduSubject();
            existOneSubject.setParentId("0");
            existOneSubject.setTitle(subjectData.getOneSubjectName());//一级分类名称
            eduSubjectService.save(existOneSubject);
        }
        //获取一级分类id值
        String pid = existOneSubject.getId();
        //添加二级分类
        //判断二级分类是否重复
        EduSubject existTwoSubject = this.existTwoSubject(eduSubjectService, subjectData.getTwoSubjectName(), pid);
        if(existTwoSubject == null) {
            existTwoSubject = new EduSubject();
            existTwoSubject.setParentId(pid);
            existTwoSubject.setTitle(subjectData.getTwoSubjectName());//二级分类名称
            eduSubjectService.save(existTwoSubject);
        }

    }
    //判断一级分类不能重复添加
    private EduSubject existOneSubject(EduSubjectService eduSubjectService,String name){
        LambdaQueryWrapper<EduSubject> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(EduSubject::getTitle,name);
        queryWrapper.eq(EduSubject::getParentId,"0");
        EduSubject oneSubject = eduSubjectService.getOne(queryWrapper);
        return oneSubject;
    }
    //判断二级分类不能重复添加
    private EduSubject existTwoSubject(EduSubjectService eduSubjectService,String name,String pid){
        LambdaQueryWrapper<EduSubject> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(EduSubject::getParentId,pid);
        queryWrapper.eq(EduSubject::getTitle,name);
        EduSubject twoSubject = eduSubjectService.getOne(queryWrapper);
        return twoSubject;

    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}
